Process of making cuprammonium solution.



[To all whom it may concern:

'about two and one-half (2%) n snares PATENT OFFICE.

HENRY BERNSTEIN, OI PB IILADELPHIA, PENNSYLVANIA.

PROCESS OFMAKING; cUPnAMMomUM SOLUTION.

No Drawing.

Patented July 26, 1910.

Be it known that I, HENRY BERNSTEIN, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful Process for Manufacturin CuprammomumSolution, of which the ollowing is a specification.

My invention relates to a new and useful process for maklng cuprammoniumsolution, at the ordlnary temperature, whlch 1s employed in themanufacture of artificial silkand it consists in adding asaccharinesubstance such as'sugar, molasses, etc., to aqua ammonia solution andbringing the same into contact with metallic copper.

It further consists'in subjecting sugarsto aquaammonia, adding this toanother solution of aqua ammonia and bringing the same into contact withmetallic copper.

- It is known that cuprammonium solution can be manufactured or made, bysubjecting metallic copper to an ammonia solution and forcing air throuh this liquid but by this method it has only been possible to obtain ercent. of copper in solutionand to reta n it in the liquid. Improvementsin the j results obtained by this process'have been made, by keeping thetemperature down to a low de-.

gree, say below 5 C. One of the principal objections to this is the*large expense in maintainin the low temperature, and in addition it 1sunhealthy and disagreeable for the workmen.

By my pro'cess, I am enabled to prepare cuprammonium-solution strongerthan heretofore, since it is well known that, under ordinarytemperatures, a 2% solution only can be obtained, but by my process Iobtain a solution of four per cent. (4%), or above, of copper, alsostable at the ordinary temperature.

In carrying out my inventionI prefer to take a solution of aqua ammoniaand add about two per' cent. (2%) of a saccharine substance, such assugar, molasses etc., thereto. This saccharine solution is then added toaqua ammonia, of suitable strength,

and this last solution is brought into contact with'the metallic copperin any form, such as strips or shavin s in a suitable Vessel and air isthen forced t rough the liquid. While any suitable solution may beemployed, I preferably take a strong aqua ammonia solution of abouttwenty per cent. (20%) strength and dissolve the saccharine substancetherein to form a saccharine solution, it being understood that bysaccharine I mean sugar, molasses or any other suitable or similarmaterial. This saccharine solution is added to an aqua ammonia solutionsixteen to twenty per cent. strength and this solution is then placedorbrought into contact with copper strips or shavings in a suitablereceptacle antl I then force air through the liquid. By this method ahigh percentage of cellulose can be dissolved and kept stable inordinary temperature.

No claim is made herein to the process of making cuprammonium solutionwherein molasses is employed, as the same is claimed in my divisionalapplication Serial No.

568,6 l1, filed June 24, 1910. p Having thus described my invention,what I claim as new and desire to secure by Let-' ters Patent, is

1. The process of making cuprammonium solution, which consists insubjecting metal-- 110. copper to a mixture or solution of-aqua ammoniaand a saccharine substance and passing a current of air through theliquid. 2. The process of making cuprammonium solution, which consistsin subjecting metal lio copper to a mixture or solution of aqua ammoniaand a sugar, and passing a current of air through the liquid.

3. The process of making cuprammonium solution, which consists indissolving sugar in aqua ammonia to form a sugar solution, adding thesugar solution to aqua ammonia of suitable strength, placing thissolution into contact with copper strips or scraps, and then forcing airthrough the liquid.

I HENRY BERN STEIN.

Witnesses:

C. D. MOVAY, M. E. RINKENBAoH.

